A shop that does plexiglass (acrylic) might be able to make an oversize
version of the knife block at the bottom of the page below. Make it to
hang under cabinet, rather than stand on counter. Size the slots for
the biggest knife, and make the layers slide out for cleaning. Another
choice for material might be food grade HDPE (high density
Polyethelene).

http://www.furitechnics.com.au/Equip...toragemain.htm